Re: Bonded downstream channels

The upper in green are line of sight and you can probably see their tower lights from rooftops if there aren't trees in the way. A 6" piece of wire may pick them up. Neither data base was updated since January and it's possible some channels moved out of the 600 mHz area for Sprint to use for 5G service. Those will be ch 37 on up.

You need to print out a tv and cable ch frequency chart, ch's 2-13 are the same but 14 on up are very different between broadcast and cable. Also use the actual RF channel frequency not the virtual or aliased one that broadcasters were allowed to keep so that "TV2" didn't need to change their logo to "TV33.1" etc. My understanding is any new or hanged licensees must now use the same Virtual as their actual rf channel they transmit on.

a 5 or 6" piece of wire is a 1/4 wave and works well for the 500 mHz channels that are strong, I'd start with a really short, out of resonance wire to see what's really strong where you are, this ingress might be a harmonic of an FM radio station, business band or public safety radio.

Re: Bonded downstream channels

This is the signal page from my neighbor a couple of poles further downstream on my block. She's using a leased modem/router wireless gateway from Spectrum, has almost 86 days uptime. Her modem has also skipped 519 and 525 MHz.

Re: Bonded downstream channels

the node has serious issues, her s/n is on the low side and also has a lot of skipped channels as well, problem is that these aren't very strong local broadcast channels so it doesn't appear to be from broadcast TV. Must be some sort of head end or amplifier overload/mixing issue.

here's the list of her slip[ped channls by what local tv broadcast channels they'd be on.

Re: Bonded downstream channels

I did an on-air scan with no wire connected to the antenna/coax on the TV. It found no channels..... but I noticed as the scan went through the channel numbers, it displayed each number for about 4 or 5 seconds and then moved up to the next number EXCEPT for channels 29, 33, and 35. For those three channels during the channel scan, it sat on them for about four times as long, almost as if it was trying the pick up a weak signal. All three of those channels are listed in the closest green range at TVFool.

Your tv is connected to the cable box by HDMI cable, not coax, correct?

Nothing is on the antenna connector, set the setup for an antenna connection to see if there are really strong channels that get in with nothing connected. Then try a 2" piece of wire like a bent open paperclip.Then try a 5" wire. You'll probably need to compare them with what's listed on tvfool to find the actual channels rather than the aliases that some are still using... Need to see if yo u pick up a 22 or 23 which are on 519 and 525 mHz

Re: Bonded downstream channels

use a bent open paperclip, lol.... bet you get a bunch of watchable channels, lol.

This could be an issue with something transmitting on 1/3, 1/5, 1/7th the affected modem frequencies, like comercial broadcast or 2 way radio.

We get our tv channels on one fiber and the data on a second pair . , that way they don't have to send full bandwidth thru a single fiber pair and can split data nodes a lot easiersince the video goes to all homes. (at least with non SDV channels in the starter& standard tiers that DTA's pick off) bad/ misaligned hybrid fiber combiner splitter. This starts to get really complicated if some homes have internet only filters on their drops out at the pole tap off as those filters upset impedance at other ports on the same tapoff

It could also be a bad cable box or computer tuner card or a direct connected "cable ready" TV or VCR injecting crap back up the line( my Hauppage cards glitch the cable box when in channel scan or when changing channels, they do decode clear qam)

Looks like this may be bad multiple fiber combiners s that have seperate TV and data channels combined together and something is out of alignment. could be a head end issue as well.

I'd expect those 3 channels your tv is trying to lock onto to interfere with the modem, they're not... so it doesn't look like direct ingress.

Re: Bonded downstream channels

Dropped DS channels behavior has returned, along with the newer T4 reboots every couple of nights. This evening I see this.... you can see it trying to pick up a sixth channel (573 MHz) but the SNR is too low so it doesn't appear in the codeword section.

Downstream Bonding Channel Value

Channel ID

9

12

13

15

18

20

Frequency

507000000 Hz

525000000 Hz

531000000 Hz

543000000 Hz

561000000 Hz

573000000 Hz

Signal to Noise Ratio

38 dB

39 dB

38 dB

38 dB

38 dB

26 dB

Downstream Modulation

QAM256

QAM256

QAM256

QAM256

QAM256

QAM256

Power Level

The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading